Aja Ekadashi falls in waning phase of the moon in the month of Bhadrapada (August – September) according to Hindi Hindu Calendar. The importance of this Ekadashi was mentioned by Lord Krishna to Yudhisthira and is found in the Brahmavaivarta Purana. It is believed that a person who observes this Ekadashi becomes free from the reactions of his/her sinful activities.
One day a great sage by the name of Gautama visits the city where Harischandra was working. He looks at Harischandra and understands the plight of Harischandra. Gautama advices Harischandra to observe the Ekadashi Vrat on the Krishna paksha Ekadashi of Sravana Month as per Telugu Calendar. Gautama tells Harischandra that the Krishna paksha Ekadashi of Sravana Month is known as Aja Ekadashi or Ananda Ekadashi, which has the power to cleanse all the sins that were done in the past. Gautama also explains the procedure that, merely by fasting on the Aja Ekadashi and eating the food the next day within the Dwadashi time would fetch him immense virtue, by means of which he can overcome all his miseries.